Solder for incandescent-lamp filaments.



HANS KUZ EL, OF BADEN, NEAR. VIENNA, AUSTRIA arnum. ,omuon.

nunoanir, assxcnon T0 GENERAL.

ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

SOLDER FOR INCANDESCENT-LAMP FILAMENTS.

969,109. No Drawing.

'10 all whom it may concern:

Be it known that .I, HANS KUznL, of Baden, near Vie-nna, Empire of Austria-Hungary, have inyented certain new and useful Improvements in Solders for Incandescent- Lamp Filaments, of which the following is a full. clear, and exact description. -l\'ly invention relates to improvements in solders for electrically connecting the filaments of electric incandcscence lamps to the supply wires, described in my prior patent of Feb. '9, 1909, No. 912,245. My improvement consists in connecting the filaments of electric incandescence lamps with their supply Wires by means of the cal-bid of almninium with or without the addition of an excess of one of its constituent elements. The carbid of aluminium is particularly suitable for establishing such con uection on account of the. great resistance aluminium offers to disintegration under the action of hightension currents or, as it is called, its great cathodic har ness. This great resistance to dlsintegratlonmf aluminium makes the connection made with its carbid very durable and reliable even in in; high voltage,

candescence lamps operated at WhQYflS when the connection between the filaments and supply wires of electric incandeseence lamps are made in the usual way by means of a cement, the latter is destroyed after a comparatively short time, particularly when the lamp is operated \vith'high voltage alternating currents.

I add in many cases to the aluminium carbid a substance capable of raising its melting temperature. Such substance may be any of the metals melting at very high temperatures, as manganese, eromium, molybdenum, tungsten, uranium, vanadium, tantalum. niobium, titanium, thorium, zirconium, nickel, cobalt and iron or the carbids thereof and also antimony, .the alloys of which with aluminium have a melting temperature by about 400 centigrade higher than pure aluminium. may be a mixture of two or more of thesaid elements or their carbids or of such elements and carbids. Besides in many cases I add to the aluminium carbid, substancescapable of increasing the adhesion of the fused aluminium.carbid to the materials to be soldered, viz: the filament and the supply wires. Such adhesion increasing substance Specification of letters Patent. -Application filed November 20, 1906. Serial No. 344,334.

Or such substance Patented maybe any one of the metals, copper, silver, gold, platinum, osmium and iridium or their carbon compounds.

I am aware that copper, gold, platinum, osmium and iridium do not form well defined cal-bids (whereas silver does) but it is well known that these metals absorb com heated in the presence of the latter and these absorption products I Wish to be understood to be included in the term carbon compounds. 01' such adhesion increasing substance may be a mixtu re of two or more of the said metals or their carbon compounds, or of such metals and carbon compounds.

In carrying out my invention I bring the points to be connected into contact with a highly heated '(that is to say heated up to fusion or softening) *mass composed of the carbid of aluminium with or Withoutan excess of one of its constituent elements (either carbon or aluminium) and with or without the addition of substances capable of raising the melting temperature, such as antimony or meta-ls melting at high temperatures or their ca'rbids and With or without the addition of as coppcr','gold, silver, platinum, osmium or iridium or their carbon compounds. While so heated, the'mass adheres to the parts to be connected and on.cooling down and setting it firmly connects the same, forming a good electric connectionwhich will not be disintegrated even by currents of very high voltage. I

The soldering. may be eli'ected in various (a) Aluminium carbid readily formed with or without an excess of one of its constituentelements and with or withoutthe addition of asubstance'capable of raising the melting temperature of such carbid and with or without the addition of a substance capable of increasing the adhesion to the parts to be connected "is applied while in a molten state to .the points of connection and is then permitted to cool down. and thereby to set so that the parts are firmly soldered together: or

(b) The substance or mixture of substances .named under (L are mixed with a. suitable agglomerant to form a plastic mass which is applied while cold to the points of connection, then dried and then highly beat- Aug. 30, 1910.

adhesion increasing substances such -1 'ai-ati\'e1y large quantities of carbon when ed, that is to say, heated to a tem erature at metals and carbon or carbonaceous substances) are mixed with an agglomerant to form aplastic mass. This p astic mass is applied while cold to the points of connection and is then highly heated, preferably by the electric arc and in 'vacuo or in a neutral atmosphere orin other words in the absence of gases capable of attacking the elements used. B such heating the carbon compounds are ormed andathe mass is fused or softened; on cooling down and setting it firmly connects the parts.

In theelectric incandescence lamps made by the process hereinbefore described thefilaments are connected to their supply wires by a solder consisting of aluminium carbid with or without an excess of its constituent elements and with or without the addition of the other substances above named, such solder forming a mass solidified after melting or sintered.

I claim as my invention:

1. As a means of forming connections for incandescent lam filaments, a solder con; taining carbid o aluminium.

2. As a means for formin connections for electric incandescentlamp filaments, a solder containing carbid of aluminium, and a substance increasing the adhesion of the aluminum carbid to metals.

3. As a means of formin connections for electric incandescent lamp laments, a solder containin carbid of aluminium with a substance raising the normal melting temperature of alumlnium,

4. As a means of formin donnections for electric incandescent lam 1a1nents,a solder consisting of carbid of a uminium with the addition of an excess of one of its constituent elements and a substance raising the normal melting temperature of aluminium.

5. As a means of formin connections for electric incandescent lamp laments, a solder consisting of carbid of aluminium with the addition of a substance raising the normal melting temperature of aluminium and increasing the adhesion of aluminium carbid to metals.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

- HANS KUZEL. Witnesses:

JofiN GEORGE Horn), 'Anvns'ro S. Hoenn. 

